Optical power modulation vital sign detection method and measurement device
First Claim
1. A vital sign measurement device comprising:
- a sensor pad adapted to be placed against an anatomical location of a subject, within which is an artery;
an optical sensing system comprising an optical waveguide comprising an elastomer, an optical source device to supply optical energy to a first end of the optical waveguide, and an optical detector to detect an amount of optical energy exiting the second end of optical waveguide;
a waveguide support structure comprising a non-compliant surface, the waveguide support structure supporting at least a portion of the optical waveguide, wherein the optical waveguide is positioned between the sensor pad and the waveguide support structure such that pressure applied to the sensor pad causes the optical waveguide to compress between the sensor pad and the wave guide support structure such that the optical sensing system will produce a reduction of the amount of optical energy exiting the second end of the optical waveguide; and
an output unit configured to receive a signal indicative of the amount of light exiting the second end of the optical waveguide and to generate a measure of the vital sign based at least in part on the received signal.
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Abstract
A vital sign measurement device includes a sensor fixation device, a sensor frame, an optical sensing system, and an output unit. The sensor fixation device is adapted to be placed against an anatomical location of a subject. The optical sensing system includes an optical waveguide, an optical source device to supply optical energy to the optical waveguide, and an optical detector to detect an amount of optical energy exiting the optical waveguide. The optical sensing system is adapted to sense an arterial pulse from the compression or flexing of at least a portion of the optical waveguide resulting in reduction of the amount of light exiting the optical waveguide. The output unit is configured to receive a signal indicative of the amount of light exiting the optical waveguide and to generate a measure of the vital sign based at least in part on the received signal.
89 Citations
18 Claims
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1. A vital sign measurement device comprising:
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a sensor pad adapted to be placed against an anatomical location of a subject, within which is an artery; an optical sensing system comprising an optical waveguide comprising an elastomer, an optical source device to supply optical energy to a first end of the optical waveguide, and an optical detector to detect an amount of optical energy exiting the second end of optical waveguide; a waveguide support structure comprising a non-compliant surface, the waveguide support structure supporting at least a portion of the optical waveguide, wherein the optical waveguide is positioned between the sensor pad and the waveguide support structure such that pressure applied to the sensor pad causes the optical waveguide to compress between the sensor pad and the wave guide support structure such that the optical sensing system will produce a reduction of the amount of optical energy exiting the second end of the optical waveguide; and an output unit configured to receive a signal indicative of the amount of light exiting the second end of the optical waveguide and to generate a measure of the vital sign based at least in part on the received signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of measuring a vital sign in a subject, the method comprising:
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transmitting optical energy into a first end of an optical waveguide comprising an elastomer, the optical waveguide positioned between a sensor pad and a waveguide support, the sensor pad being positioned against an anatomical location of a subject, within which is an artery, the optical waveguide being adapted to compress in response to an arterial pulse causing the sensor pad to move; detecting, using an optical detector held by the sensor frame, an amount of optical energy exiting a second end of the optical waveguide and generating therefrom a signal indicative of optical energy received, the amount of optical energy exiting the second end of the optical waveguide changing in response to an arterial pulse; and generating a measure of the vital sign using the generated signal indicative of the optical energy exiting the second end of the optical waveguide. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A method of measuring a subject'"'"'s blood pressure, the method comprising:
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applying a varying pressure to an anatomical location of a subject, within which is an artery; detecting an arterial pulse waveform with an optical power modulation sensor as a function of the applied and varied pressure, the optical power modulation sensor including an optical waveguide comprising an elastomer adapted to be compressed between a sensor pad and a waveguide support structure in response to an arterial pulse causing the sensor pad to move, the compression of the optical waveguide resulting in a reduction in the amount of light transmitted to an end of the optical waveguide, the arterial pulse waveform being detected from the amount of light exiting the end of the optical waveguide; and determining a systolic blood pressure and a diastolic blood pressure based on the detected arterial pulse waveform as a function of the applied and varied pressure.
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Specification